<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="react">

</div>
<script src="data.js"></script>
<script src="bundle.js"></script>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
<script>
    $('body').css('background','#ccc')
</script>
</body>
</html>